Depending on the circumstances, it could be, but generally I would say no. That answer changes if it starts to interfere with your daily life or your relationships. Carrying expectations over from porn, which is a byproduct of watching lots of porn more often than most are willing to admit, is also bad. As long as you keep in mind that porn is not always representative of actual sex between a couple (or more, if you add people to the mix, haha) then that's fine. I also agree with the above - if it makes you feel bad, then it is not worth it.